import { ElMessage } from "element-plus";
import { AxiosResponse } from "axios";


/**
 * 下载文件
 * @param response
 * @returns
 */
export const downloadFile = (response: AxiosResponse) => {
  console.log("response.data.type:", response.data.type);
  return new Promise((resolve, reject) => {
    const fileReader = new FileReader();
    fileReader.onload = function () {
      try {
        console.log("result:", this.result);
        const jsonData = JSON.parse((this as any).result); // 成功 说明是普通对象数据
        if (jsonData?.code !== 200) {
          ElMessage.error(jsonData?.message ?? "请求失败");
          reject(jsonData);
        }
      } catch (err) {
        // 解析成对象失败，说明是正常的文件流
        const blob = new Blob([response.data]);
        // 本地保存文件
        const url = window.URL.createObjectURL(blob);
        const link = document.createElement("a");
        link.href = url;
        const filename = response?.headers?.["content-disposition"]
          ?.split("filename*=")?.[1]
          ?.substr(7);
        link.setAttribute("download", decodeURI(filename));
        document.body.appendChild(link);
        link.click();
        resolve(response.data);
      }
    };
    fileReader.readAsText(response.data);
  });
};
